The Rant LL Cool Peg features a small diameter forged steel inner core with replaceable nylon/fiberglass blended outer sleeve that slides well on all surface types including steel, concrete, brick and wood. The smaller diameter core allows the nylon sleeve to be thicker for longer life while also reducing weight. Sold Individually. Axle: 14mm Bore w/ 3/8" Adapter Included Diameter: 1.46" (37mm) Length: 4.52" (115mm) Weight: 7.6 oz (Each)